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65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
# vector2.py
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# shotmanager
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#
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# A two-dimensional vector class.
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#
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# Created by Will Silva on 11/22/2015.
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# Copyright (c) 2015 3D Robotics.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import math
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class Vector2:
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def __init__(self, x, y):
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self.x = x
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self.y = y
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# normalizes self and returns the length
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def normalize(self):
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length2 = self.x * self.x + self.y * self.y
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length = math.sqrt(length2)
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if length != 0: # if our vector is a zero vector
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self.x /= length
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self.y /= length
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return length
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def length(self):
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length2 = self.x * self.x + self.y * self.y
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return math.sqrt(length2)
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def dot(a, b):
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return a.x * b.x + a.y * b.y
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def __add__(self, vector):
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return Vector2(self.x + vector.x, self.y + vector.y)
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def __sub__(self, vector):
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return Vector2(self.x - vector.x, self.y - vector.y)
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def __mul__(self, scalar):
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return Vector2(self.x * scalar, self.y * scalar)
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def __rmul__(self, scalar):
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return Vector2(scalar * self.x, scalar * self.y)
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def __repr__(self):
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return "<%f,%f>" % (self.x, self.y)
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def __str__(self):
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return "<%f,%f>" % (self.x, self.y)
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def __iter__(self):
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return iter([self.x, self.y])
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